Switchboard Choices for Domoticz Raspberry: Balancing Automation & Tradition, Expander Options

Hello
How do you solve your separateness?
I am finishing home electrics and automation.
Relays planned in cans, transmission on twisted pair. I want to be able to give up automation and go back to tradition. I put a second, smaller one under the raspberry and lsa kron connectors above the electrical switchboard.
I am thinking of a connector expander for raspberry and arduino. I want duplicate devices and the possibility of a quick change
Have any of you solved it similarly? Which expanders did you use? I'm thinking about it https://botland.com.pl/raspberry-pi-hat-ekspa...kspander-wyrożen-gpio-dla-raspberry-pi-32b-z- Szybkozlaczami.html
Lsa plans to connect all twisted pairs to the connectors, plus two power and ground rails.

jaremas wrote:

I am thinking of a connector expander for raspberry and arduino. I want duplicate devices and the possibility of a quick change

You can develop it. what expanders are you writing about and how should this quick stopper look like, what for what?

I mean pin expanders with Raspberry. I sent the link to the expander in the first post. As for the fastener, I want to have a second Raspberry with an SD clone ready in case of failure.

What you have linked is a board that allows you to connect to GPIO cables.
The expanders are e.g. 74HC165 for inputs and 74hc595 for outputs. This tile does not have it.
Do you need a lot of IO? Any Arduino, including mega, can also play the role of IO. There are libraries for this - firmata.

That's exactly what I mean. They call them expanders, but they don't have multiplexers, well ...
As for the amount of IO, I will support Arduino Mega or BeagleBone Black. I have not made a decision yet.

These things start with a piece of paper and a pen. Design assumptions are listed and then appropriate components are selected.

I used pcf8574A at my expander role with uln 2803 and smiaga az nice